If my angelfish went after phantom tetras, I think it will go after the congos tetras since the ones at my lfs are small.I'm partial to congo tetras, not nippy if you keep them fed, you can keep just a few, don't need a large school, nice looking, especially males with their fins. Not regionally correct to SA, but neither are barbs, danios, loaches, or quite a few other common fish. I've also kept emperor tetras with angels. Emperors more sensitive ime, but I like them also and didn't find them nippy if you keep them fed.